<template>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model.trim="user.name" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model="user.age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="user.sex">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
      <button @click="addOrEditFn">添加/修改</button>
    </div>
    <div v-show="arr.length > 0">
      <table border="1" cellpadding="10" cellspacing="0">
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(obj, index) in arr" :key="index">
          <td>{{ index + 1 }}</td>
          <td>{{ obj.name }}</td>
          <td>{{ obj.age }}</td>
          <td>{{ obj.sex }}</td>
          <td>
            <button @click="delFn(index)">删除</button>
            <button @click="editFn(obj, index)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>
 
<script>
export default {
  name: "stuMsg",
  data() {
    return {
      editIndex: -1,
      user: { name: "", age: 0, sex: "" },
      arr: [
        { name: "Tom", age: 19, sex: "男" },
        { name: "Jerry", age: 18, sex: "女" },
      ],
    };
  },
  methods: {
    addOrEditFn() {
      //添加或修改方法
      if (this.editIndex === -1) {
        this.arr.push({ ...this.user });
      } else {
        //编辑
        this.$set(this.arr, this.editIndex, { ...this.user });
        this.editIndex = -1;
      }
      this.user = { name: "", age: 0, sex: "" };
    },
    editFn(obj, index) {
      this.user = { ...obj };
      this.editIndex = index; //正在编辑的索引
    },
    delFn(index) {
      this.arr.splice(index, 1);
    },
  },
};
</script>